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1
Grahn, Alexander, Greg Cartland-Glover e Eckhard Krepper. "CFD Modellierung einer partikelbelasteten Kühlmittelströmung im Sumpf und in der Kondensationskammer". Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-27796.
Testo completoAbstract (sommario):
Der Bericht beschreibt die Arbeiten zur CFD-Modellentwicklung zur Beschreibung des Fasertransportes in einer Wasserströmung, die im Unterauftrag der Hochschule Zittau/Görlitz erfolgten. Während die experimentellen Arbeiten zu dieser Thematik in Zittau durchgeführt wurden, lag der Schwerpunkt der theoretischen Arbeiten in Rossendorf. Im Arbeitspunkt EZ 1 des Projektantrages ist die Erweiterung der Einzeleffektuntersuchungen vorgesehen. Die entsprechenden Modellansätze zum Partikeltransport sind im Kapitel 3.1. beschrieben. Die Modellanpassung und Validierung ist in 3.2 und 3.3 dargestellt. Der Fasertransport in einer Wasserströmung wird durch Jet-Phänomene bestimmt. Untersuchungen dazu sind im EZ3.1 des Projektantrages: 3D-Phänomene infolge Blasenmitriss vorgesehen und die Modellansätze und der Vergleich zu Experimenten in den Kapiteln 4.1 bis 4.3 dargestellt. Des Weiteren wird der Einfluss auf den Ausgleich der Temperatur für den Fall untersucht, dass der Jet kälter als die Wasservorlage im Tank ist. Dieser Abschnitt entspricht damit der EZ3.2 des Antrages: 3D-Phänomene infolge Temperaturdifferenzen. Im Kapitel 4.4 wird auf die Strömungsvorgänge in der Zittauer Strömungswanne eingegangen und damit der Punkt EZ4 des Antrages: Integraluntersuchungen bearbeitet. Kapitel 5 beschreibt die Entwicklung eines Sieb-Modells, das die Faser-Kompaktierung berücksichtigt und auf der Darcy-Gleichung basiert. Die Modellparameter werden an Experimenten in Zittau justiert. Diese Experimente wurden für verschiedene Materialien durchgeführt und mit deren Hilfe ein Koeffizientenkatalog erstellt. Das Modell wurde in den CFD-Code CFX implementiert und anhand einiger Anwendungsbeispiele demonstriert.
2
Grahn, Alexander, Greg Cartland-Glover e Eckhard Krepper. "CFD Modellierung einer partikelbelasteten Kühlmittelströmung im Sumpf und in der Kondensationskammer". Forschungszentrum Dresden-Rossendorf, 2009. https://hzdr.qucosa.de/id/qucosa%3A21606.
Testo completoAbstract (sommario):
Der Bericht beschreibt die Arbeiten zur CFD-Modellentwicklung zur Beschreibung des Fasertransportes in einer Wasserströmung, die im Unterauftrag der Hochschule Zittau/Görlitz erfolgten. Während die experimentellen Arbeiten zu dieser Thematik in Zittau durchgeführt wurden, lag der Schwerpunkt der theoretischen Arbeiten in Rossendorf. Im Arbeitspunkt EZ 1 des Projektantrages ist die Erweiterung der Einzeleffektuntersuchungen vorgesehen. Die entsprechenden Modellansätze zum Partikeltransport sind im Kapitel 3.1. beschrieben. Die Modellanpassung und Validierung ist in 3.2 und 3.3 dargestellt. Der Fasertransport in einer Wasserströmung wird durch Jet-Phänomene bestimmt. Untersuchungen dazu sind im EZ3.1 des Projektantrages: 3D-Phänomene infolge Blasenmitriss vorgesehen und die Modellansätze und der Vergleich zu Experimenten in den Kapiteln 4.1 bis 4.3 dargestellt. Des Weiteren wird der Einfluss auf den Ausgleich der Temperatur für den Fall untersucht, dass der Jet kälter als die Wasservorlage im Tank ist. Dieser Abschnitt entspricht damit der EZ3.2 des Antrages: 3D-Phänomene infolge Temperaturdifferenzen. Im Kapitel 4.4 wird auf die Strömungsvorgänge in der Zittauer Strömungswanne eingegangen und damit der Punkt EZ4 des Antrages: Integraluntersuchungen bearbeitet. Kapitel 5 beschreibt die Entwicklung eines Sieb-Modells, das die Faser-Kompaktierung berücksichtigt und auf der Darcy-Gleichung basiert. Die Modellparameter werden an Experimenten in Zittau justiert. Diese Experimente wurden für verschiedene Materialien durchgeführt und mit deren Hilfe ein Koeffizientenkatalog erstellt. Das Modell wurde in den CFD-Code CFX implementiert und anhand einiger Anwendungsbeispiele demonstriert.
3
Ruhnke, Norman [Verfasser], Bernd [Akademischer Betreuer] Sumpf, Bernd [Gutachter] Sumpf, Günther [Gutachter] Tränkle e Paul Michael [Gutachter] Petersen. "A deep ultraviolet laser light source by frequency doubling of GaN based external cavity diode laser radiation / Norman Ruhnke ; Gutachter: Bernd Sumpf, Günther Tränkle, Paul Michael Petersen ; Betreuer: Bernd Sumpf". Berlin : Technische Universität Berlin, 2020. http://d-nb.info/1219573914/34.
Testo completo
4
Sumpf, Tilman [Verfasser], e Meinhard [Akademischer Betreuer] Schilling. "Model-based T2 Relaxometry using Undersampled Magnetic Resonance Imaging / Tilman Sumpf ; Betreuer: Meinhard Schilling". Braunschweig : Technische Universität Braunschweig, 2012. http://d-nb.info/1175822620/34.
Testo completo
5
Schmid, Martin. "Morphologie, Vergesellschaftung, Ökologie, Verbreitung und Gefährdung der Sumpf-Löwenzähne (Taraxacum sect. Palustria Dahlst., Asteraceae) Süddeutschlands /". Stutttgart : Schweizerbart, 2003. http://catalogue.bnf.fr/ark:/12148/cb39146354t.
Testo completo
6
Haldemann, Christoph. "Veränderungen der Kohlehydrat-, Protein- und Aminosäurengehalte in Sumpf- und Röhrichtpflanzenrhizomen am natürlichen Standort und nach experimentell bedingtem O₂-Mangelstress /". [S.l : s.n.], 1987. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Testo completo
7
Tawfieq, Mahmoud [Verfasser], Günther [Akademischer Betreuer] Tränkle, Günther [Gutachter] Tränkle, Paul Michael [Gutachter] Petersen e Bernd [Gutachter] Sumpf. "Development and characterisation of a diode laser based tunable high-power MOPA system / Mahmoud Tawfieq ; Gutachter: Günther Tränkle, Paul Michael Petersen, Bernd Sumpf ; Betreuer: Günther Tränkle". Berlin : Technische Universität Berlin, 2019. http://d-nb.info/1182423795/34.
Testo completo
8
Sumpf, Kristina [Verfasser], Carsten [Akademischer Betreuer] Lüder, Thomas [Gutachter] Meyer e Martin [Gutachter] Oppermann. "Einfluss von HDAC-Inhibitoren auf die Expression IFNγ-regulierter Gene und die Parasitenentwicklung in Toxoplasma gondii-infizierten Makrophagen / Kristina Sumpf ; Gutachter: Thomas Meyer, Martin Oppermann ; Betreuer: Carsten Lüder". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1149958677/34.
Testo completo
9
Sumpf, Birthe Inken [Verfasser]. "Untersuchung von TEMRA-Zellen und deren Subsets in Patienten mit schwerer Aortenklappenstenose sowie die vergleichende Untersuchung von zwei unterschiedlichen Behandlungsmethoden im Hinblick auf das adaptive Immunsystem / Birthe Inken Sumpf". Berlin : Freie Universität Berlin, 2018. http://d-nb.info/1160235694/34.
Testo completo
10
Backéus, Ingvar. "Aboveground production and growth dynamics of vascular bog plants in central Sweden". Uppsala : Stockholm : Svenska växtgeografiska sällskapet ; Almqvist & Wiksell International [distributor], 1985. http://catalog.hathitrust.org/api/volumes/oclc/12807002.html.
Testo completo
11
Melander, Texas. "Design of a Mobile Pump Sump". Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-201650.
Testo completoAbstract (sommario):
Vid gruvdrift krävs det att grundvattnet pumpas undan och det görs med hjälp av ett system av pumpar placerade i utsprängda sumpar där vatten samlas. Dessa gropar är stora och dyra att tillverka och de lider ofta av problem med sedimentering. När en tunnel inte längre används fylls denna ofta igen med sten och allt arbete och alla pengar som lagts på att spränga ut dessa gropar går förlorade. Detta har lett till att Xylem vill testa ett koncept med en mobil pumpsump som kan återanvändas på en annan plats.Denna rapport beskriver processen där ett koncept för en mobil pumpsump har utvecklats med utgångspunkt från Xylem’s produktserie TOP. TOP-serien består av prefabricerade självrensande pumpsumpar avsedda för avloppsnät. Sumparna är designade för att grävas ned i marken och när sumpen är nedgrävd sker all åtkomst till sumpen ovanifrån via en servicelucka.En simulering av en serie sumpar utfördes för att undersöka vad som var en lämplig sumpvolym och när denna var bestämd modifierades övriga delar av sumpen för att passa ändamålet. Utöver detta designades en mobil enhet att montera sumpen på. Denna enhet innehåller bland annat en serviceplattform och en skyddsram och den möjliggör även lyft med gaffeltruck.In mining it is required that the ground water is pumped away and it is done by a system of pumps placed in blasted sumps where water is collected. These pits are large and expensive to make and they often suffer from problems with sedimentation. When a tunnel no longer is being used it often refilled with rocks and all the work and money put into blasting the sumps is lost. This has led to that Xylem wants to test a concept with a mobile pump sump that can be reused in another location.This report describes the process where a mobile pump sump has been developed whit starting point from Xylem’s product series TOP. The TOP-series consists of prefabricated pump sumps intended for sewage systems. The sumps are designed to be placed under the ground and when they are buried all access is given from above via a service hatch.A simulation of a series of pumps was made to investigate what an appropriate sump volume would be and when that was decided the other parts of the sump was modified to suit the intended purpose. In addition to this a mobile unit on which the sump is mounted was designed. This unit includes a service platform and a protective frame and it also enables lifting with a forklift.
12
Bockman, Samuel Jacob. ""Sump-Inlet" deployment linkage design for sargassum ocean sequestration (SOS)". Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123255.
Testo completoAbstract (sommario):
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019Cataloged from PDF version of thesis.
Includes bibliographical references (page 42).
Invasive floating sargassum seaweed has become a serious problem for Caribbean nations due to the blocking of fisheries and distinct rotten smell that disincentivizes tourism to these countries. The solution to this problem conceived in Luke Gray's master's thesis was to pump the sargassum to a depth where the hydrostatic pressure is sufficiently greater than the sargassum bladder internal pressure such that the bladders are compressed, and the plant sinks [1]. This would be achieved by feeding a mixture of sargassum and seawater through a suction hose to an onboard solids pump, which then transports the sargassum to a depth where the hydrostatic pressure renders the sargassum negatively buoyant. One inlet device, discussed in Gray's thesis, is called the "sump-inlet" which operates much like an oil skimmer, controlling and enforcing a high solids concentration by locating a weir close to the free surface of the water. Once sargassum and seawater flows over the weir, into the sump, the sargassum is dragged downward toward suction piping, against its natural rate-of-rise, due to the constrained cross-sectional area of the sump and the high downward fluid velocity. With this method chosen, a single DOF linkage system was needed to deploy the sump-inlet and constrain it during operation. The hydrodynamic response of this linkage must ensure that the weir stays at an acceptable depth, in as wide a range of sea states as possible, to avoid inconsistent solids concentration and dry-running. Dimensions and mass properties of the sump-inlet linkage were informed by Gray's hydrodynamics model [1]. This thesis focuses on structural analysis of the deployment linkage, deck frame, attachments, and pivot.
by Samuel Jacob Bockman.
S.B.
S.B. Massachusetts Institute of Technology, Department of Mechanical Engineering
13
Baraghini, Beatrice. "Experimental investigation on the factors governing groundwater control by sump pumping". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1335/.
Testo completo
14
Hoppe, Mark Mathew. "Validation of computational fluid dynamics model of a simple pump sump with vertical intake". Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86337.
Testo completoAbstract (sommario):
Thesis (MScEng)--Stellenbosch University, 2014.ENGLISH ABSTRACT: The designs of pump intake structures are generally verified by means of a hydraulic model study to ensure the structure will operate without large air or swirl entraining vortices. This is an expensive and time consuming process. The popularity of Computational Fluid Dynamics (CFD) is ever increasing in the engineering world and the use thereof in the modelling of flows in pump intake structures is just one of the many areas of focus. The use of a validated CFD model in the design phase of pump intakes would be beneficial, and ideally would reduce the frequency of requiring hydraulic model studies. This study investigates the applicability of using a 3 dimensional CFD model as a design tool by validation with a physical model. A physical model of a simple pump intake was available and with a few modifications the flow conditions were significantly improved. The quantitative validation of the CFD model was carried out by means of comparing corresponding point velocity magnitudes. An Acoustic Doppler Velocimeter (ADV) was used in the physical model. The data obtained were successfully filtered to remove noise and other disturbances. The qualitative validation was done by means of photographs and observations. The photographs made use of illuminated tracer particles to identify flow patterns. The CFD model compares well qualitatively, but the velocity magnitudes are not yet sufficiently reliable. It is recommended that the CFD model can be used for qualitative studies, but future research should focus on the accuracy of the CFD model. Using higher resolution velocity measurements in the physical model by means of other types of instruments, a better comparison can be made, as well as enabling validation of the ADV readings.
AFRIKAANSE OPSOMMING: Die ontwerpe van die pomp inname strukture word gewoonlik bevestig deur middel van 'n hidrouliese model studie om lug-intrekking te minimeer. Dit is 'n duur en tydrowende proses . Die gebruik van Computational Fluid Dynamics ( CFD ), ‘n tipe numeriese modelle neem toe in die ingenieurswese wêreld. Die gebruik daarvan in die modellering van vloei in pomp inname strukture is net een van die vele areas van toepassing . Die gebruik van 'n betroubare CFD model in die ontwerp fase van pomp innames sal voordelig wees , en ideaal sou die noodaaklikheid van fisiese hidrouliese model studies verminder. Hierdie studie ondersoek die toepaslikheid van die gebruik van 'n 3 -dimensionele model CFD model as 'n ontwerp instrument deur bevestiging met 'n fisiese model . 'n Eenvoudige pomp-inname model was beskikbaar en het met ‘n paar veranderinge die vloei toestande aansienlik verbeter . Die kwantitatiewe bevestiging van die CFD model is uitgevoer deur middel van vergelyking van korresponderende punt snelheid groottes. In die fisiese model is die snelhede met 'n Akoestiese Doppler Velocimeter (ADV) gemeet. Die data wat verkry is suksesvol gefiltreer om geraas en ander versteurings te verwyder . Die kwalitatiewe bevestiging is gedoen deur middel van foto's en waarnemings. In die foto's is gebruik gemaak van verligte spoor deeltjies om vloei patrone te identifiseer. Die CFD model vergelyk kwalitatief goed, maar die snelheid groottes is nog nie voldoende betroubaar nie. Dit word aanbeveel dat die CFD model gebruik kan word vir kwalitatiewe studies, maar toekomstige navorsing behoort te fokus op die verbeteringe van dieakkuraatheid van die CFD model. Met behulp van 'n hoër resolusie snelheid metings van die fisiese model, deur middel van ander tipe instrumente, kan 'n beter vergelyking gemaak word , sowel as die geldigheid van die ADV lesings in staat te stel.
15
Liapis, Evagelos. "The supF assay for understanding DNA adduct-induced mutagenesis : traditional application and development of a site-specific version". Thesis, University of Leicester, 2007. http://hdl.handle.net/2381/29719.
Testo completoAbstract (sommario):
A primary aim of this study was to establish and utilise the supF assay to investigate the mutagenicity of the cancer drug tamoxifen in target endometrial cells. In particular, the supF assay was employed to ascertain the mutations caused by two model reactive intermediates of tamoxifen, alpha-acetoxytamoxifen and 4-hydroxytamoxifen quinone methide (4-OHtamQM) in methylated pSP189 plasmid. The plasmid was methylated in vitro in order to allow application of the LwPy53 algorithm which enables in silico prediction of the G→T mutation distribution along the human p53 gene, using alpha-acetoxytamoxifen and 4-OHtamQM-induced mutation data from the supF assay.;Relative mutation frequencies increased proportionally with the adduct level for alpha-acetoxytamoxifen, up to ∼15 times the background frequency, while 4-OHtamQM failed to raise the mutation frequency above that of the untreated control. The majority of mutations in alpha-acetoxytamoxifen-treated plasmid were GC →TA transversions, while GC→AT transitions predominated in both 4-OHtamQM-treated plasmid and the untreated control. Based on the p53 G→T transversion predictions, alpha-acetoxytamoxifen induced damage resulted in two hotspots at positions 244 and 273; these mutations might be expected to occur in tamoxifen associated endometrial tumours if tamoxifen adducts play a role in cancer development.;The second part of the thesis was devoted to the development and validation of a novel site-specific assay. The assay, which is a site-specific version of the supF assay, was validated and utilized to investigate the mutagenic potential and types of mutations caused by individual O 6-MeG adducts situated in intact double stranded or gapped plasmids, within two different sequence contexts, in both E. coli and human cells.
16
Stjern, Magnus, e Aldenfalk Staffan Jansson. "Investigation of pattern recognition algorithms to determine depth and volume of water inside the sump of a pumping station". Thesis, KTH, Radio Systems Laboratory (RS Lab), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-149256.
Testo completoAbstract (sommario):
Pattern recognition is now considered a fundamental building block in many fields. The ability to interact with a computer or vice versa is no longer limited by how fast the computer is, but rather what an application developer can think of. Today many modern, real-time applications, such as high performance and high quality graphics can be combined with a Xbox Kinect to do object tracking and Google Glass to provide a heads up display. These applications can also be combined with other sensors and actuators to produce monitoring systems that can give facilities' operators "telepresence" throughout a facility. To be able to computationally interpret movement or patterns in an image it is imperative to investigate the application of this technology. The research conducted at Xylem has focused on a very specific problem: How can pattern recognition be utilized to dynamically determine the volume and depth of water in a sump at a pumping station. The equipment currently used to determine the water level depends upon being either below or alongside the water's surface, this puts the equipment under great stress due to the nature of a pumping station. Xylem is one of the leading global water technology companies, hence sewage-pumps are one of its main products. The main equipment utilized in this thesis project consists of a camera attached to the interior at the top of the sump in a pumping station connected to a computer. The software developed includes a simple graphical user interface (GUI). This GUI was implemented in C# and is designed to continuously collect data from a camera for subsequent analysis. Our algorithm utilizes anti-correlation between many images taken during a short interval to determine the actual water level. The known dimensions of the sump are then used to calculate the volume of water. Most of the depth values produced by our software were correct and we were able to correctly estimate the water level with an error of less than 4 cm, this corresponds to a volume error of 62 liters for a 140 cm wide sump. Our algorithm was able to monitor the depth over time inside a pumping station in a simulated live environment. This accuracy is obtained with a time window of 1 second. The results of this system are important because it shows that it is possible to use a camera to measure water depth. This provides pump owners and operators with valuable information regarding the current state of the pump, both in terms of current water depth and an image of possible anomalies such as the presence of foreign objects in the sump.Mönsterigenkänning betraktas numera som en grundläggande byggsten inom många områden. Möjligheten att kunna interagera med en dator eller vice versa är inte längre begränsat av datorkraft, utan snarare av vilken slags applikation en utvecklare kan komma på. Idag kan många moderna realtidsapplikationer, såsom högpresterande datorer och högkvalitativ grafik kombineras med en Xbox Kinect för att utföra objektspårning och Google Glass för att åstadkomma en huvudburen display. Dessa applikationer kan även kombineras med andra sensorer samt manöverdon för att skapa övervakningssystem som kan ge anläggningsoperatörer möjlighet till fjärrövervakning i en anläggning. För att beräkningsmässigt kunna tolka rörelser eller mönster i en bild är det nödvändigt att utforska tillämpningen av denna teknologi. Forskningen utförd på Xylem har fokuserat på ett väldigt specifikt problem: Hur kan mönsterigenkänning användas för att dynamiskt detektera volymen och vattendjupet i en sumpstation? Utrustningen som vanligen används för detektering av vattennivån är beroende av att vara antingen under eller i linje med vattennivån. Detta utsätter utrustningen för stora påfrestningar på grund av miljön inuti i en pumpstation. Xylem är ett av de globalt ledande företagen inom pumpar, följaktligen är avloppspumpar en av deras huvudsakliga produkter. Den huvudsakliga utrustningen som används i detta projekt är en kamera kopplad till en dator som monteras på den inre och översta delen av en sump i en pumpstation. Programvaran som utvecklats inkluderar ett enkelt grafiskt interface. Detta interface implementerades i C# och är designat för att kontinuerligt samla in data från en kamera för efterföljande analys. Vår algoritm använder sig utav anti-korrelationen mellan många bilder tagna under ett kort intervall för att bestämma det verkliga vattendjupet. De kända dimensionerna av pumpstationen används sedan för att beräkna volymen av vattnet. De flesta djupmätningar genererade av vårt program var korrekta och vi har lyckats korrekt uppskatta vattennivån med ett fel på mindre än 4 cm. Detta motsvarar ett volymfel på 62 liter för en sump med en diameter på 140 cm. Vår algoritm har lyckats övervaka hur djupet ändras med tiden i en live-simulerad miljö. Denna noggrannhet erhålles med ett tidsfönster på 1 sekund. Resultatet av detta system är viktigt eftersom det visar att det är möjligt att använda en kamera för att mäta vattendjup. Detta ger pumpägare och operatörer värdefull information om befintligt skick av en pumpsump, både i form av aktuellt vattendjup samt en bild av möjliga avvikelser såsom förekomsten av främmande objekt inuti sumpen.
17
Farkhondeh, Ehsan. "Design of a dry sump lubrication system for a Honda® CBR 600 F4i engine for Formula SAE applications". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36310.
Testo completoAbstract (sommario):
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.Includes bibliographical references (leaf 34).
A dry sump lubrication system for a Formula SAE race car was designed and manufactured in order to gain the various advantages this type of system affords. A dry sump system stores oil in an external tank and pumps it between the engine and tank as needed. This allows for a shallower oil pan, which permits lower engine placement. This lower placement improves handling through a lower center of gravity. Additionally, the highly stressed racing engine, a Honda CBR 600 F4i, receives more constant lubrication than a conventional wet sump system. The system included design of a new pan, tank and the associated bracketry and hoses that are needed to make the system functional. The design of the system stressed reliability while keeping an eye on weight to minimize it whenever possible. Detailed analysis and the methodology driving the design choices are presented here along with simple dry sump theory. This document serves as the roadmap through the design of the first dry sump system on an MIT FSAE car. It should prove beneficial to the team when the official design report is created for the competition. Lastly, it will help assist future members who certainly aim to refine the package in subsequent years to make it smaller, cheaper, lighter, more reliable and simply better performing overall.
by Ehsan Farkhondeh.
S.B.
18
Lahti, Erik Anders. "An Experimental Approach to Assessing Material Corrosion Rates in a Reactor Containment Sump Following a Loss of Coolant Accident". The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1373990419.
Testo completo
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Schuch, André Passaglia. "Avaliação da ação genotóxica induzida pela radiação ultravioleta solar na molécula de DNA". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/87/87131/tde-30042010-094124/.
Testo completoAbstract (sommario):
Nesse projeto, foi desenvolvido um sistema biológico que denominamos Dosímetro de DNA, com o objetivo de avaliar a ação genotóxica da radiação UV solar a partir da produção de lesões na molécula de DNA. Para determinar os diferentes tipos de danos, utilizamos enzimas de reparo de DNA e anticorpos específicos. Complementando estas análises, foram ainda realizados ensaios de frequência de mutação e da taxa de inativação biológica de DNA. Através da utilização dessa tecnologia foi possível confirmar a produção de lesões CPDs e 6-4PPs após a irradiação em lâmpadas de UVB e UVA. Outro fator importante foi a maior indução de danos oxidativos que a banda de UVA apresentou em relação à de UVB. Exposições ambientais demonstram claramente que a luz solar possui diferentes perfís de indução de lesões de DNA, que variam de acordo com a localidade da irradiação, e que fenômenos biológicos como inativação de DNA e mutagênese são diretamente dependentes da presença de fotoprodutos na molécula de DNA e não estão associados aos danos oxidativos. Portanto, o sistema Dosímetro de DNA é capaz de fornecer uma ampla compreensão da ação genotóxica da luz solar e informações inovadoras que poderão ser utilizadas no desenvolvimento de substâncias fotoprotetoras mais eficientes.To better understand the impact of solar UV radiation upon DNA molecule, we developed a biological system based on the exposure of plasmid DNA to artificial and natural UV sources. The quantification of DNA lesions was performed through the use of specific DNA repair enzymes and antibodies. The biological effects of sunlight, as well as artificial UV-radiation, were evaluated through the determination of the DNA inactivation rate and mutagenesis frequency. Through the application of this technology, we could detect the induction of CPDs and 6-4PPs after exposures to UVB and UVA lamps. Interestingly, the induction of oxidative damages was significantly higher after UVA than UVB radiation. Surprisingly, the profiles of induction of DNA damages observed after sunlight exposures have presented variations especially according to the latitude. In addition, our data clearly indicate that the induction of these biological effects is directly related to the presence of photoproducts in UV-exposed DNA samples, and suggest that oxidative damages are not related to these biological processes. Therefore, a very suitable system was developed capable of providing a wide comprehension of the biological effects of solar-UV radiation upon the DNA molecule.
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Ortiz-Soto, Elliott (Elliott A. ). "Design of oil consumption measuring system to determine the effects of evolving oil sump composition over time on diesel engine performance and emissions". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36719.
Testo completoAbstract (sommario):
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.Includes bibliographical references (leaf 51).
The automotive industry is currently struggling because of the increasingly stricter emissions standards that will take effect in the near future. Diesel engine emissions are of particular interest because they are still less understood than gasoline powered internal combustion engines. On the solid side of the exhaust emissions picture, particulates, or Soot and Ash, play the most important part. It has been found that ash is mostly a product of the fuel and oil composition. An oil consumption measuring system is then necessary if the relationship between oil consumption and ash increase in the sump oil and exhaust system is to be properly determined. This Thesis project consisted of experimentally measuring the variation of oil sump composition of a single-cylinder diesel generator set during a continuous running, steady state test. This was measured using ICP-AES (ICP-OES) elemental analysis technique, and the Total Base Number for the oil was also determined. An effective and reduced cost oil consumption and replenishing system was developed with this purpose.
(cont.) The oil composition analysis demonstrated that the concentration of inorganic/metallic compounds (Ca, P, Zn, Mg) that contribute to ash increased throughout the test, jointly with oil consumption. The oil consumption measuring system developed was also found to be fairly accurate; with an approximate 2.2% error, probably due to oil hold-up. These results were then used to determine the possible effects of oil composition and oil consumption on Ash emissions and exhaust aftertreatment technologies.
by Elliott Ortiz-Soto.
S.B.
21
Studený, Martin. "Vyhodnocení provozu tlakové stokové sítě obcí Heroltice - Vohančice - Březina". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409708.
Testo completoAbstract (sommario):
The subject of the thesis is the evaluation of the operation of the existing pressure sewer network in a selected location. The aim is to describe the problems with the operation of pressure sewerage and to evaluate the operation of this network based on design parameters.
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Červenková, Martina. "Studie odkanalizování a likvidace odpadních vod obce Větřní". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240218.
Testo completoAbstract (sommario):
This thesis deals with possible options for solving drainage in the village Větřní - Frymburk st. and School st. and adjacent villages Lužná, Dolní Němče and Dobrné. The first part describes the current state of sanitation of Větřní and its adjacent area. It also includes assessment of the condition of the current sewer system in the village Větřní, which is connected with some newly proposed sewerages. The following chapter deals with the technical description of the possible variants of the drainage sites including economic evaluation. Then there is a recommendation of choices of variant and evaluation of overall investment and operating costs. In conclusion of the chapter there are summarized advantages and disadvantages of variants of drainage.
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Souza, Patrícia Caldeira de. "Codisposição de lodo de fossa séptica em aterro sanitário do tipo trincheira". Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/5470.
Testo completoAbstract (sommario):
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Given the problematic situation of basic sanitation in Brazil, where many regions are not served by sewage systems, one of the alternatives of the municipalities is to use Individual and Household Sewage Disposal (SITDE), attached as an option for the disposal of domestic sewage. The Residue of Fossa and Septic Tank (RFTS), generated in SITDE is intended, for the most part Sewage Treatment Station (ETE). However, not all municipalities have ETE and due to high load of pollutants and pathogenic organisms in RFTS, there must be an alternative to its proper destination in order to ensure the quality of the environment and preserve public health. Therefore, this study aimed to evaluation of codisposição of RFTS impacts with Urban Solid Waste (RSU) in landfills trench type. For this, four experimental cells were built in the open in the area of the landfill in the city of Goiânia, to receive the following sludge percentage: 0%, 2%, 5% and 9%. Based on the individual volume of the trenches (5 m3), set up an array of 40 kg/day of RSU in each trench, three times a week for five months, from April to August 2013. After the release of RSU in the trenches, they were compressed manually, RFTS codisposto on waste and later it was used to cover the ground. The RFTS used in the study was characterized according to the parameters pH, Biochemical Oxygen Demand (DBO), Chemical Oxygen Demand (DQO), total solids, fixed total solids, total volatile solids, total suspended solids, fixed suspended solids, volatile suspended solids, sedimented solids, turbidity, ammonia nitrogen and total phosphorus. The results showed that the moisture content of RSU grounded to a depth meter increased with the incubation time, and the volatile solids remained constant. In quantitative terms, the sludge codisposition in different percentages did not affect the volume of leachate generated. As to the quality of the leachate, there was an increase in total solids concentrations for the parameters, COD, BOD and ammonia nitrogen in the trenches receiving cavity residues and septic tank, in particular at concentrations of 5 and 9%. The presence of total coliforms and Escherichia coli was stabilized in very close values with the passage of time in all trenches do not indicate a long-term impact. For pH, who always remained in the alkaline range, the addition of the sludge did not result in changes considered significant. It is recommended to carry out further studies adopting other levels of pit residue concentrations and septic tank trench in landfills.
Perante a situação problemática do saneamento básico no Brasil, em que diversas regiões não são atendidas por redes coletoras de esgoto, uma das alternativas dos municípios é a utilização de Sistemas Individuais de Tratamento e Disposição de Esgoto Doméstico (SITDE), que figura como uma opção para a disposição do esgoto doméstico. O Resíduo de Fossa e Tanque Séptico (RFTS) gerado nos SITDE é destinado, na maioria das vezes, para Estações de Tratamento de Esgoto (ETE). Entretanto, nem todos os municípios brasileiros possuem ETE e, devido à elevada carga de poluentes e organismos patogênicos presentes nos RFTS, é preciso que haja uma alternativa para sua destinação adequada com o intuito de garantir a qualidade do meio ambiente e preservar a sáude pública. Diante disso, neste trabalho objetivou-se a avaliação dos impactos da codisposição dos RFTS com os Resíduos Sólidos Urbanos (RSU) em aterros sanitários tipo trincheira. Para tanto, foram construídas quatro células experimentais a céu aberto ná área do aterro sanitário do município de Goiânia, para receberem, os seguintes percentuais de lodo: 0%, 2%, 5% e 9%. Com base no volume individual das trincheiras (5 m3), definiu-se uma disposição de 40 kg/dia de RSU em cada trincheira, três vezes por semana, durante cinco meses, de abril a agosto de 2013. Após os lançamentos dos RSU nas trincheiras, os mesmos eram compactados manualmente, o RFTS codisposto sobre os resíduos e, posteriormente, utilizava-se o solo para cobertura. O RFTS utilizado no estudo foi caracterizado segundo os parâmetros pH, Demanda Bioquímica de Oxigênio (DBO), Demanda Química de Oxigênio (DQO), sólidos totais, sólidos totais fixos, sólidos totais voláteis, sólidos suspensos total, sólidos suspensos fixos, sólidos suspensos voláteis, sólidos sedimentáveis, turbidez, nitrogênio amoniacal e fósforo total. Os resultados obtidos demostraram que o teor de umidade dos RSU aterrados a um metro de profundidade aumentou com o tempo de incubação, e que os sólidos voláteis permaneceram constantes. Em termos quantitativos, a codisposição do lodo em diferentes percentuais não interferiu no volume do lixiviado gerado. Quanto à qualidade do lixiviado, observou-se aumento das concentrações para os parâmetros sólidos totais, DQO, DBO e nitrogênio amoniacal nas trincheiras que receberam os resíduos de fossa e tanque séptico, em especial nas concentrações de 5 e 9%. A presença de coliformes totais e Escherichia coli foi estabilizada em valores bastante próximos com o decorrer do tempo, em todas as trincheiras, não indicando um impacto em longo prazo. Para o pH, que permaneceu sempre na faixa alcalina, a adição do lodo não implicou em alterações consideradas significativas. Recomenda-se a realização de outros estudos adotando outros níveis de concentrações de resíduo de fossa e tanque séptico para trincheiras em aterros sanitários.
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Ondruch, Marek. "Trubkový držák lyžiny rally vozu Škoda Fabia Super 2000". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230923.
Testo completoAbstract (sommario):
This diploma thesis “Tubular Skid Holder of Skoda Fabia Super 2000 Rally Car” is aimed to engineering design of tubular skid holder of rally car Skoda Fabia Super 2000. There is used FEM software for analysis s evaluation of current variant and following variants of engineering design. The most relevant final variant design, which is consistent with asked stiffness and reduction of weight, was chosen based on findings.
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Weiß, Frank-Peter. "Aktuelle Themen der Reaktorsicherheitsforschung in Deutschland". Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28406.
Testo completoAbstract (sommario):
Die Veranstaltung widmete sich mit der Borverdünnung in Druckwasserreaktoren bzw. mit der Verstopfung der Sumpfansaugsiebe durch freigesetztes Isolationsmaterial schwerpunktmäßig zwei Themen der Reaktorsicherheit, die auch in aktuellen Aufsichtsverfahren eine Rolle spielen. Eingebettet in den internationalen Kontext wollten die Veranstalter die sicherheitstechnische Bedeutung dieser Themen für die deutschen Anlagen beleuchten und die Auswirkungen auf die zu erbringenden Sicherheitsnachweise und den Anlagenbetrieb darstellen. Dabei kamen Gutachter, Vertreter der Forschung, Hersteller und Betreiber gleichermaßen zu Wort. Der Fachtag sollte den Teilnehmern aber insbesondere vermitteln, welche Beiträge die privat und öffentlich finanzierte Reaktorsicherheitsforschung zur Aufklärung der jeweiligen Ereignisabläufe und ihrer sicherheitstechnischen Bedeutung geleistet hat. In diesem Forschungskontext spielen, auch international, die Methoden der so genannten Computational Fluid Dynamics (CFD) eine zunehmende Rolle. Deshalb widmete sich eine Sitzung den Grundlagen, Möglichkeiten und Grenzen von CFD-Methoden. Dabei wurden u.a. Anwendungen zur Borvermischung und zum Verhalten von Mineralwolle im Sumpf präsentiert.
26
Weiß, Frank-Peter. "Aktuelle Themen der Reaktorsicherheitsforschung in Deutschland". Forschungszentrum Rossendorf, 2006. https://hzdr.qucosa.de/id/qucosa%3A21667.
Testo completoAbstract (sommario):
Die Veranstaltung widmete sich mit der Borverdünnung in Druckwasserreaktoren bzw. mit der Verstopfung der Sumpfansaugsiebe durch freigesetztes Isolationsmaterial schwerpunktmäßig zwei Themen der Reaktorsicherheit, die auch in aktuellen Aufsichtsverfahren eine Rolle spielen. Eingebettet in den internationalen Kontext wollten die Veranstalter die sicherheitstechnische Bedeutung dieser Themen für die deutschen Anlagen beleuchten und die Auswirkungen auf die zu erbringenden Sicherheitsnachweise und den Anlagenbetrieb darstellen. Dabei kamen Gutachter, Vertreter der Forschung, Hersteller und Betreiber gleichermaßen zu Wort. Der Fachtag sollte den Teilnehmern aber insbesondere vermitteln, welche Beiträge die privat und öffentlich finanzierte Reaktorsicherheitsforschung zur Aufklärung der jeweiligen Ereignisabläufe und ihrer sicherheitstechnischen Bedeutung geleistet hat. In diesem Forschungskontext spielen, auch international, die Methoden der so genannten Computational Fluid Dynamics (CFD) eine zunehmende Rolle. Deshalb widmete sich eine Sitzung den Grundlagen, Möglichkeiten und Grenzen von CFD-Methoden. Dabei wurden u.a. Anwendungen zur Borvermischung und zum Verhalten von Mineralwolle im Sumpf präsentiert.
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Andersson, Patrik, e Morgan Wallin. "Low Loss Articulated Hauler Axle : A Conceptual Study". Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63842.
Testo completoAbstract (sommario):
Volvo Construction Equipment is highly regarded for robust products, but with an increasing competition in their market, development of the product portfolio is more important than ever. One step being carried out is to reduce losses in powertrains and increase the fuel efficiency for solutions such as articulated haulers and wheel loaders. This would eventually lower the fuel costs and emissions for the end customer. With this development, Volvo CE could strengthen their position in the market while also contributing to reducing the construction industry's environmental impact. By investigating the front bogie axle of the recently introduced hauler, Volvo A60H, important information about possible reductions and the distribution of the current losses were found. The investigation focused on a front bogie axle, but some of the results are applicable for other applications such as wheel loaders as well, since a lot of the technology in the axles are similar. A conceptual study was performed where completely new ideas were generated, such as implementing a dry sump system in the axle, as well as ideas for improving the subcomponents currently found in the axle. Two cases were presented for the evaluation of concepts, one with a fully loaded dump body and low speeds, and one with an unloaded dump body and a wider speed interval. The concepts were later evaluated using calculation tools such as MATLAB and a Simulink-model was created for the losses in the axle. When combining concepts that reduces load dependent losses, a potential reduction of 64% of the axle's total losses was achieved for the case with a full dump body. The largest improvement found for the load independent losses was 8% with an unloaded hauler and the highest speed investigated, 50 km/h. A dry sump system improves the axle's efficiency with 45% in optimal working conditions, but was found to lower the efficiency at other conditions. Room for improvement of axle losses currently exists both for load dependent and load independent losses. The evaluation performed pointed towards the load dependent losses being the largest influence on the total losses, even with an unloaded dump body and high speeds. This is an interesting observation since a lot of work at Volvo CE has revolved around reducing the load independent losses since these are easier to affect with different lubrication levels and rotational speeds. A test methodology for load dependent losses should be implemented in order to validate the results of this thesis work, and also to aid further development at Volvo CE.
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Zeileis, Achim. "A unified approach to structural change tests based on F statistics, OLS residuals, and ML scores". Institut für Statistik und Mathematik, WU Vienna University of Economics and Business, 2005. http://epub.wu.ac.at/714/1/document.pdf.
Testo completoAbstract (sommario):
Three classes of structural change tests (or tests for parameter instability) which have been receiving much attention in both the statistics and econometrics communities but have been developed in rather loosely connected lines of research are unified by embedding them into the framework of generalized M-fluctuation tests (Zeileis and Hornik, 2003). These classes are tests based on F statistics (supF, aveF, expF tests), on OLS residuals (OLS-based CUSUM and MOSUM tests) and on maximum likelihood scores (including the Nyblom-Hansen test). We show that (represantives from) these classes are special cases of the generalized M-fluctuation tests, based on the same functional central limit theorem, but employing different functionals for capturing excessive fluctuations. After embedding these tests into the same framework and thus understanding the relationship between these procedures for testing in historical samples, it is shown how the tests can also be extended to a monitoring situation. This is achieved by establishing a general M-fluctuation monitoring procedure and then applying the different functionals corresponding to monitoring with F statistics, OLS residuals and ML scores. In particular, an extension of the supF test to a monitoring scenario is suggested and illustrated on a real-world data set.Series: Research Report Series / Department of Statistics and Mathematics
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Chicuta, Andrea Maiumi. "Estudo experimental sobre recuperação de oleo pesado atraves da combustão in-situ". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265527.
Testo completoAbstract (sommario):
Orientador: Osvair Vidal TrevisanDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica e Instituto de Geociencias
Made available in DSpace on 2018-08-14T23:36:31Z (GMT). No. of bitstreams: 1 Chicuta_AndreaMaiumi_M.pdf: 9556550 bytes, checksum: 8000d9d7bdfe26ea2ecd6564777de501 (MD5) Previous issue date: 2009
Resumo: Este trabalho foca a recuperação melhorada de petróleo através da técnica conhecida como combustão in-situ. Ensaios experimentais foram realizados com óleo pesado de 12,8ºAPI procedente de um campo onshore no Brasil a fim de avaliar a influência da argila no meio poroso com saturações iniciais de óleo variando de 25 a 50%. O aparato experimental utilizado consiste em: sistema de injeção de fluido, tubo de combustão, sistema de produção de fluidos, sistema de análise gasosa e gasômetro, e sistema de aquisição e análise de dados. Os resultados experimentais obtidos mostram que o fenômeno da combustão é possível para o óleo e a rocha testados. Além disto, estes testes fornecem parâmetros importantes que indicam a ocorrência de reações de oxidação. A argila tem um papel fundamental na deposição de combustível e conseqüentemente na propagação da frente de combustão. Na ausência de argila no meio poroso a frente não foi sustentada, enquanto que na sua presença foi obtido um comportamento da frente de combustão estável. Já o aumento da saturação de óleo ocasionou um maior depósito de combustível. Temperaturas entre 457 à 501ºC foram obtidas na frente de combustão e fator de recuperação de óleo acima de 84%. Verificou-se que as velocidades da frente de combustão variaram entre 14,1 a 18,3 cm/h. Além disto, uma melhora na qualidade do óleo entre 3,2º a 8,4ºAPI foi observada no óleo produzido. Os parâmetros básicos da combustão - consumo de combustível, ar requerido, razão ar/combustível, razão atômica de H/C, utilização de O2 - obtidos durante os experimentos são favoráveis à implantação do método de combustão in-situ e devem servir de guia para o projeto piloto de campo.
Abstract: The present work refers to an experimental study on oil recovery by in-situ combustion. Experimental tests were performed with a heavy oil of 12.8ºAPI from a Brazilian onshore field with the main purpose to survey the influence of clay content in the reservoir rock with initial oil saturations ranging from 25 to 50%. A specific apparatus used can be described in: gas injection system, combustion tube, fluid production system, gas analysis system and control and data recording system. The results indicate that the in-situ combustion method is technically applicable to the rock-fluid system tested. Moreover, the tests were useful in providing the proper range of parameters for the oxidation reactions to occur. Clay has proved to play a key role on fuel deposition and, consequently, on propagation of the combustion front. In a clean sand rock medium, the combustion front was not self-sustained, while with its presence sustainable combustion reactions were achieved. And the increase in oil saturation resulted in a greater fuel deposition. Front peak temperatures were recorded in the range of 457 - 501 ºC for oil recovery factors greater than 84%. Results show combustion front velocities to span between 14.1 to 18.3 cm/h. Worth mentioning, upgradings of 3.2º to 8.4º API were observed in the produced oil. The basic combustion parameters - fuel consumption, air requirement, air-fuel ratio, atomic H/C ratio, oxygen utilization - obtained during the experiments are favorable to the implementation of insitu combustion and shall be used as a guide to the pilot project planned for the field.
Mestrado
Reservatórios e Gestão
Mestre em Ciências e Engenharia de Petróleo
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Vrána, Radek. "Variantní řešení odkanalizování obce Dětkovice". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265256.
Testo completoAbstract (sommario):
The aim of this diploma thesis is to elaborate alternative designs of the Dětkovice sewer network. The first part deals with reasons of this work and the area of interest. In the next part the thesis deals with describe of current condition and proposed alternative designs. Furthermore, the economic assessment of alternative designs is elaborate.
31
Galuška, Jiří. "Modelování vtokových vírů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318713.
Testo completoAbstract (sommario):
This paper covers information research of basic design rules of industrial wet sumps. It describes mathematical models of vortices and method for their identification and visualization. Then the author focuses on CFD modeling of surface vortices with single phase and multiphase approach with Volume of Fluid method. Basic principles of multiphase CFD modelling in OpenFOAM and ANSYS Fluent are given. Description and benchmarking of suitable turbulence models is also present. The single phase and multiphase approach were successfully validated for a simple test case of bathtub surface vortex. Satisfactory agreement with experimental data was achieved. The accuracy and behavior of both solvers were compared between each other. This gives us useful tool for evaluation of inflow condition and danger of surface vortex occurrence in wet sumps. The acquired knowledges were used to design an experimental test case with geometry similar to industrial wet sump. A map of surface vortex occurrence has been created for different operating points. One of the operating point has been used for numerical simulation (both single phase and multiphase). Partial agreement with experimental observation has been achieved.
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Kouřilová, Vendula. "Novostavba vinařského domu". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227610.
Testo completoAbstract (sommario):
The subject of this master thesis is a design of wine house which comes together with restaurant and accommodation in Strazovice near Kyjov. It includes design study and all the detailed drawings of the building. The building is designed with three services - winery, restaurant and accommodation. Winery is divided into separate rooms for wine processing, finishing and wine aging, also storage, distribution and sale of wine. Canteen service includes kitchen with accessories, restaurant with dining, separated lounge, vaulted cellar and room for degustation. Lounge, cellar and degustation room is primary determined for different corporate events, conferences, weddings, family events and others. For building were chosen descending lands at the edge of Strazovice.. The main reason for this decision is the view that this place provides because of its higher position. Also this village is a part of region, for which wine production is typical. The shape of the object is rectangular and consists of three floors. Two upper floors are receding with comparison to the first floor. This formed a part of terrace which is connected with the oval part on pillars. Basement is situated completely below ground, only the south side is partly uncovered. Construction is made of reinforced concrete. Ground floors are with ventilated frontage. Frontage of the first floor is covered with wooden cladding, and frontage of the second floor is covered with plaster. Vertical constructions are made of lime-sand blocks and horizontal constructions are reinforced concrete. The roof is built of wooden trusses with arched upper part. On the roof there are installed photovoltaic panels for electricity which is used in the building. Rainwater is held in tank, servers as a water supply for the building. Wastewater is depurated in small sewage plant which is further conducted into the building. Other wastewater is captured in the sump. Projection of the winery emphasis, inter alia, on static and
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Sumpf, Joachim [Verfasser]. "Simulationsgestützte Methoden zur Ermittlung der Wirkung partizipativer Maßnahmen auf den lokalen Verkehr / von Joachim Sumpf". 2008. http://d-nb.info/989006131/34.
Testo completo
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Chao, Wei-yuan, e 趙偉淵. "Study on Pumping Sump Flow". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/18546937406349591171.
Testo completoAbstract (sommario):
碩士逢甲大學
水利工程與資源保育研究所
100
There are engineering and non-engineering measures for protecting the low-lying areas from flooding, and installing pumping stations is one commonly adopted engineering measure. Undoubtedly the efficiency of pumping is directly affected by the dimensions of the well, or the boundary conditions of the pump station. However, the published optimal sizing criteria for wells can lead to lower cost-benefit ratios due to the degrees of land alteration and volume of excavation occurring on-site. Therefore, understanding the mechanism about how the scales of the well on pumped flow field can help to achieve higher efficiency in pumping operations. The primary factors in well sizing include: the width of the well (B), suspension height (C), immersion depth (hs), and distance to the back wall (T). In this study, the CFD software package ANSYS CFX 13.0 program was applied to construct the pumping-well models, and the computation in pumped flows assumed that the flow field remains in steady-state and the fluid was incompressible. Two physically based indexes, the uniformity in the distribution of flow velocity and root-mean-square of weighted velocity, were used to assess the state of velocity steadiness and efficiency of the pumping station. By using the experiments and results given by Lin (2004), and the indexes of uniformity and weighted velocity, this study concluded that Vu=100% and θ= 90o to be ideal values. On the basis of simulations we also determined the relation between efficiency of pumping and forms of the back wall as well as different sizing specifications. The results indicated that the optimal sizing dimensions for a rectangular back wall are B = 2.5D, C = 0.9D, hs = 2.5D and T = 0.75D. And the optimal sizing dimensions for a semi-circular back wall are T = 0.75D, B≧ 2.8D, and 0.9D ≦C ≦ 1.3 D, D is the diameter of the bell The optimum setup conditions will facilitate the installations of pumping facilities in the future.
35
Wei-LiangChuang e 莊偉良. "Numerical Study on Pump Sump Flows". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/30574031870699034004.
Testo completoAbstract (sommario):
碩士國立成功大學
水利及海洋工程學系碩博士班
98
Large-scale hydraulic pump sumps are widely used in cooling system of power-generation plants, flooding control station, and sewage-disposal plants. It is crucial to evaluate the uniformity and stability of the pump-sump flow which has significant influence on the pump performance. For this problem, experimental approach is mainly applied in assessing such problem for many years. However, with the rapid development of the computer capability, three-dimensional numerical modeling becomes an alternative to simulate the pump-sump flows and understand the mechanism of the vortex formation. In contrast to the limitation caused by the measuring method, numerical modeling can perform the flow field anywhere in the intake model. Moreover, if several sets of modified setups are concerned, numerical modeling can reduce a great number of costs in construction and operation for experiment. In this study, three-dimensional incompressible Navier-Stokes equation is solved, and the turbulent fluctuation is filtered and modeled by Large Eddy Simulation model. The momentum equation is discretized by Finite Volume Method in hybrid structured and unstructured grids. The solid wall is treated as no-slip condition. The uniform flow condition is employed at inflow and outflow surfaces. In this thesis, the validation on numerical model will be performed in two distinct intake models. Two experiments are cited: Lin (2004) and Ansar et al. (2001). For the comparisons in the approaching flow, including velocity profiles and flow patterns, the simulation results well agree with both experiments. Meanwhile, the simulation consisting of a complicated suction bell is made in contrast to consider it as simple circular cylinder in previous study. Furthermore, instead of replacing the main channel with known velocity profile done by Ansar et al. (2002) who solved the inviscid solution, present study considering the main channel can capture further subtle phenomena. In case study, the flows in the intake pipe are numerically investigated for various flowrates and modified setups. As for vertical velocity distribution, reverse flow occurs in the region above the throat, but no negative vertical velocity appears in the suction bell. The vorticity distribution indicates that a pair of strong, nearly symmetric swirl exists around the pipe center. Since swirl angle is widely used to evaluate the pump performance in experiment, the approach with numerical results is performed and discuss in this thesis.
36
Chih-YaoYang e 楊智堯. "Effects of hydraulic structures on pumping sump flows". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/02822892667895689261.
Testo completoAbstract (sommario):
碩士國立成功大學
水利及海洋工程學系碩博士班
98
Large-scale pumps have been extensively used in sewage treatment plants, flood control pumping stations, and circulating cooling water system of electric power plants. The whole system contains lots of complicated hydraulic structures. While designing the sump, the project technical specification such as Unite States Standard (HI) and Britain’s standard (BHRA), etc. are widely consulted at present. However, those project technical specifications are established in ideal simple conditions, while the extra structures increasing, it still has to do the physical modeling test to ensure the security and understand the variation in flow fields. The experimental model of present paper is designed according to the second nuclear power plant of Taiwan. Detailed three-dimensional measurements of the approach flow in the pump sump were obtained by using an Acoustic Doppler Velocimeter(ADV), discussion on uniform and non-uniform flow in front of the suction pipe. The swirl angles at the throat of the suction pipe were also measured by swirl meter to investigate effects of different suction structures and observed the frequency of free surface vortices appearance. Besides, also discussed the relationship between the effects upon baffle wall and it’s place. The experimental results show that the pump-approach flow distributions are stable with uniform flow. The average turbulent intensity with non-uniform flow increased 1.5 to 2 times compared to uniform flow. Generally speaking, turbulent intensity is directly proportional to the distance of suction pipe. The baffle wall performed very well in terms of mitigating the intensity and appearing frequency of free surface, and the best installation place is in the middle of free surface. The suction structure is able to improve the flow condition. The test result is almost no difference to diverse suction structure angles. The about mentioned results would be referred to the important of intake structure in the future.
37
Tasi, Wei-chang, e 蔡維倡. "Applying CFX to Simulate the Flow Uniformity of the Pipe Opening in a Rectangle Pumping Sump". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/67801599336845075966.
Testo completoAbstract (sommario):
碩士逢甲大學
航太與系統工程所
99
The first step of this thesis is to verify CFX’s two-phase flow capability by comparing the experimential and numerical solutions from Okamura et al.【1】and莊【2】. Then, we start to simulate a pumping sump having a vertical intake pipe with a flow rate of 3 cms. The optimal target functions of the pumping sump are the velocity uniformity and the weighted average velocity of intake pipe proposed by 陸【3】, and the testing variables are the sump width B, the distance from water level to intake opening hs, and the distance from sump bed to intake opening C. The initial geometry data of the pumping sump, that is referred from the sump in Central Taiwan Science Park, are B=2.8D, C=0.9D, and hs=2.2D, where D is the intake diameter. To sum up, B is the most important factor to affect the flow field of the pumping sump. Next, C is the key factor to affect the pump efficiency. The least influential factor is hs. Although the resulting vortices on the surface of water are clear in the simulations, the phenomena of whirlpool don’t appear accurately. Therefore, it is not easy to identify the effect of hs. The optimized range is 2.8D≦ B、0.7D≦C≦1D、2D ≦hs， that could be obtained from comparing between the target function to the circumstance of flow field.
38
Lin, Chun-Po, e 林仲柏. "On the influence of an upstream sluice gate to pump sump flows in Shen-Ho Power Plant". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/5wczep.
Testo completoAbstract (sommario):
碩士國立成功大學
水利及海洋工程學系碩博士班
92
Large-scale pumps have been extensively used in sewage treatment plants, flood control pumping stations, and circulating cooling water system of electric power plants. To keep these pumps work efficiently, the flow field in front of the suction pipe must keep uniform and stable. So the design of a sump that is normally defined to be between a forbay and a suction pipe has been a very important issue. Although the geometric design of sump can refer to guidelines which were widely used, ex., the HI Standards and BHRA guidelines, these guidelines are only valid for a simple geometry. In case for complex situations, an evaluation of the preliminary design is still needed through physical modeling tests. The objectives of present paper are to investigate the pump sump flow fields under different sluice gate submergences and Froude Numbers through physical modeling tests. A 1:10 scale intake model, similar to the circulating water pump in the Shen-Ho Power Plant, was used. Detailed three-dimensional measurements of the approach flow in the pump sump were obtained by using an Acoustic Doppler Velocimeter(ADV). The distributions of mean velocity, velocity standard deviation, and vorticity in the pump sump under difference experimental conditions were discussed. The swirl angles at the throat of the suction pipe were also measured by swirl meter to investigate the influence of different sluice gate submergences and Froude Numbers. The experimental results show that without sluice gate, the pump-approach flow distributions are uniform. With sluice gate, flow separation occurred behind the sluice gate and transverse vortices formed. The velocity standard deviation and vorticity increase at higher depths. The flow at higher positions becomes the main source of disturbance. As the sluice gate submergence increases, the influenced range of flow enlarged. And vorticity, velocity standard deviation, and swirl angle also increase. As the Froude Number increases, vorticity, velocity standard deviation, and swirl angle also increase. This trend is the same as references mentioned.